package com.itheima.reggie.service.impl;
import com.alibaba.druid.sql.ast.expr.SQLCaseStatement;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomerException;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private OrderDetailService orderDetailService;
    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;


    @Override
    @Transactional
    public void submit(Orders orders) {

        //获得当前用户id
        Long userId = BaseContext.getCurrentId();

        //查询当前用户的购物车数据
        QueryWrapper<ShoppingCart> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("user_id", userId);
        List<ShoppingCart> shoppingCartList = shoppingCartService.list(queryWrapper);

        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            throw new CustomerException("购物车为空，不能下单");
        }

        Long orderId = IdWorker.getId();//生成订单号
        AtomicLong amount = new AtomicLong(0L);//总金额
        User user = userService.getById(userId);//查询用户数据
        AddressBook addressBook = addressBookService.getById(orders.getAddressBookId());//查询地址数据

        //组装订单明细信息
      List<OrderDetail> orderDetailList = shoppingCartList.stream().map(item -> {
          OrderDetail orderDetail = new OrderDetail();
          orderDetail.setOrderId(orderId);
          orderDetail.setNumber(item.getNumber());
          orderDetail.setDishFlavor(item.getDishFlavor());
          orderDetail.setDishId(item.getDishId());
          orderDetail.setSetmealId(item.getSetmealId());
          orderDetail.setName(item.getName());
          orderDetail.setImage(item.getImage());
          orderDetail.setAmount(item.getAmount());
          amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
          return orderDetail;
      }).collect(Collectors.toList());


        //组装订单数据
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress(addressBook.getDetail());

        //向订单表插入数据，一条数据
        this.save(orders);
        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetailList);

        //清空购物车数据
        shoppingCartService.remove(queryWrapper);
    }
}